Top for a bathtub



FIG. 1 is a perspective view, taken from the top, front and right side of a top for a bathtub showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken line representation of a bathtub in FIGS. 1 through 6 is for purposes of illustration only and forms no part of the claimed design. 

The ornamental design for a top for a bathtub, as shown and described. 